WEBVTT 00:00.540 --> 00:04.020 Now let's consume our new list data type. 00:04.020 --> 00:07.170 So we will initialize a new list and give some items to it. 00:07.170 --> 00:12.300 So we will then insert several items again and find out how it works. 00:12.780 --> 00:19.560 So and then we will remove an item that we previously searched for and then search for the item again 00:19.560 --> 00:21.810 to ensure that it has gone. 00:22.200 --> 00:29.190 So let's actually create our code now inside the main main.cpp file. 00:29.550 --> 00:34.590 Let's actually as you can see, our main file is empty and we will write it on the Main.cpp file. 00:34.590 --> 00:37.770 And we firstly need to initialize a list. 00:39.280 --> 00:41.620 So we will first initialize a list. 00:42.960 --> 00:44.850 Which is going to be list. 00:44.850 --> 00:45.240 List. 00:45.360 --> 00:48.420 Here's list and list. 00:49.480 --> 00:49.720 Here. 00:49.720 --> 00:55.210 We will add several items to the list, which is actually list dot insert. 00:55.950 --> 01:01.170 Uh, the list at insert from on index zero 21. 01:01.650 --> 01:03.870 List at insert. 01:05.520 --> 01:08.550 Index 1 to 99. 01:12.090 --> 01:14.700 Index to 87. 01:17.550 --> 01:21.450 Let's insert some items like let's insert actually five items. 01:21.750 --> 01:22.540 Let's start. 01:22.590 --> 01:25.050 Insert index three. 01:25.720 --> 01:27.100 6 to 9. 01:28.560 --> 01:31.650 List that insert index for. 01:32.530 --> 01:33.400 50. 01:35.560 --> 01:39.490 55 or let's actually do it more different. 01:39.580 --> 01:42.610 Decimal the 30. 01:43.710 --> 01:44.760 35. 01:44.910 --> 01:45.600 Yeah. 01:46.230 --> 01:47.580 Here, this. 01:47.580 --> 01:53.430 We added several items to the list and we also indexed value index value index value and index value 01:53.460 --> 01:53.910 here. 01:53.910 --> 01:56.670 So now we will print the current list. 01:57.840 --> 02:04.830 So in order to print that, we will use a C out list here. 02:05.830 --> 02:11.300 List elements here and after that inline. 02:11.630 --> 02:16.590 Now we will use the for loop to print this list. 02:16.610 --> 02:18.620 For E here zero. 02:18.650 --> 02:22.280 While E is less than list dot count. 02:22.280 --> 02:28.850 So as you know, we have a count which will return our list count here. 02:29.510 --> 02:30.380 So. 02:31.850 --> 02:36.170 Here list.com and then. 02:37.590 --> 02:41.760 Um, e plus plus increment E by one plus, plus e here. 02:42.390 --> 02:48.360 After that, we will use the C out list to get our index E here. 02:48.360 --> 02:57.330 So as you know, the index e will go through zero one, two, three, four, and after the five, it 02:57.330 --> 02:59.400 will be broken here. 02:59.790 --> 03:03.600 So that's why the we are getting every time different items. 03:03.600 --> 03:09.030 So that's why iterating so but I think you learned that in previous lectures so I will not mention it 03:09.030 --> 03:09.570 again. 03:10.320 --> 03:11.730 So here. 03:12.980 --> 03:20.500 Now we printed our list items using for loop, and after that we will see out. 03:20.510 --> 03:22.270 Actually, yeah we will. 03:22.280 --> 03:23.910 After that we will use the end. 03:23.930 --> 03:24.800 And here. 03:24.800 --> 03:25.430 End line. 03:26.710 --> 03:31.060 And line and and line two and line here. 03:31.780 --> 03:35.710 Now we will insert several items in the middle of the list here. 03:37.170 --> 03:42.150 List dot insert 225. 03:42.390 --> 03:49.260 For example in second and let's start insert list dot insert two. 03:50.680 --> 03:53.170 Uh, 61 here. 03:53.620 --> 03:55.540 Now we will print the list again. 03:56.200 --> 03:59.250 Uh, so in order to print it, we will copy this. 03:59.260 --> 04:01.300 Actually, we can do it here. 04:01.450 --> 04:04.380 C out new list elements. 04:04.390 --> 04:08.960 List elements here and line. 04:08.980 --> 04:11.290 And after that we will use the for loop. 04:12.220 --> 04:12.910 For loop. 04:12.910 --> 04:24.100 The integer is here zero while e is less than uh, list dot count and then it will iterate increment 04:24.100 --> 04:24.910 by one. 04:25.870 --> 04:29.680 After that we will see out the list. 04:29.680 --> 04:35.890 Dot, get here E and after that. 04:37.960 --> 04:38.440 Inline. 04:38.440 --> 04:38.910 Yeah. 04:40.100 --> 04:40.880 End line. 04:42.000 --> 04:45.330 And the section make it to lines and lines here. 04:47.310 --> 04:50.400 So now let's actually search here. 04:51.150 --> 04:57.300 Now we use the inserts and now let's actually use the search here. 04:57.300 --> 04:59.610 So we also use the get insert. 04:59.640 --> 05:01.050 Now we're going to use the search. 05:03.310 --> 05:05.730 Here now we're going to search. 05:05.740 --> 05:08.050 So, for example, let's actually search the value. 05:08.080 --> 05:24.940 61 So actually add the comments, search the value 69 and here see out search element 70 or 61 and after 05:24.940 --> 05:26.560 that inline again. 05:27.010 --> 05:28.060 So we will. 05:28.890 --> 05:31.030 Create a new integer called result. 05:31.050 --> 05:35.100 Integer result list dot search. 05:36.420 --> 05:37.320 61. 05:37.830 --> 05:41.050 And if the result result. 05:41.070 --> 05:44.640 Result is my equals to minus one. 05:44.640 --> 05:52.680 So as you remember the search item here, the search item here will return. 05:53.490 --> 05:55.500 The search item will return. 05:58.160 --> 06:07.400 Minus one, if the list is not found here, will return minus one if the list is not found. 06:08.000 --> 06:11.540 So let's delete this again and come here. 06:12.850 --> 06:13.630 Here. 06:13.780 --> 06:17.260 So then it will see out. 06:17.260 --> 06:24.250 The 61 is not found if if the result is equal to minus one. 06:24.400 --> 06:26.800 So 61. 06:28.930 --> 06:30.250 Is not found. 06:31.180 --> 06:35.830 And after that, again, end line, end line here. 06:36.250 --> 06:42.970 If the else happens, then the else statement in this case, it's that it means it found our. 06:44.060 --> 06:44.960 Index. 06:44.960 --> 06:46.280 So else. 06:48.070 --> 06:55.300 See out, 61 is found at index and we will pass the index here. 06:55.540 --> 07:01.810 The index is in this case, index is result and end line. 07:02.740 --> 07:03.250 Here. 07:04.060 --> 07:07.270 So we also use the search here. 07:09.350 --> 07:10.940 We also use the search here. 07:10.970 --> 07:15.110 Now, let's actually use the remove method here. 07:15.230 --> 07:20.760 So now after that, we will use the remote view and do some actions with it. 07:20.780 --> 07:27.890 So let's actually write a remove element at index three or index two. 07:28.610 --> 07:34.800 And here in line after that, we will release that remove tube. 07:35.240 --> 07:41.000 For example, since we are telling the user that we are going to remove the index at tube. 07:41.570 --> 07:42.920 So now. 07:46.030 --> 07:50.470 We will remove use the remove method and after that. 07:53.260 --> 07:54.190 Actually, we do. 07:54.220 --> 07:55.420 Do we print anything? 07:55.420 --> 07:55.900 Yeah. 07:55.990 --> 07:58.150 Then now we don't need anything here. 07:58.150 --> 08:00.700 So now let's actually print the list again. 08:01.410 --> 08:03.210 Signs here. 08:03.720 --> 08:04.800 Prints the list again. 08:04.800 --> 08:07.110 Print the list again. 08:07.470 --> 08:19.680 So see out new list elements here and line after that for integer here equals zero zero. 08:19.770 --> 08:25.590 While e is less than list that get get count or. 08:27.580 --> 08:32.440 Or count here and increment a by one. 08:33.500 --> 08:39.320 After that, we will print the list, that list item each time. 08:41.930 --> 08:42.800 And line. 08:43.310 --> 08:44.810 And here. 08:46.920 --> 08:54.780 We will also search the volume value of 71 again here, 60, 61 again. 08:54.780 --> 09:05.400 So search the value 61 again to check if it is removed here. 09:06.350 --> 09:08.270 Now see out. 09:09.070 --> 09:16.420 Search the element 71 or 61 again and after the line. 09:18.960 --> 09:22.470 Now the result is going to be less that search. 09:23.330 --> 09:24.170 71. 09:24.350 --> 09:30.650 So as again, if our the result if our result is equal to minus one. 09:30.650 --> 09:40.850 So this means we couldn't find anything and we will print the user that 71 is not found or 71. 09:40.940 --> 09:41.720 61. 09:42.320 --> 09:43.610 Oops, not 71. 09:43.790 --> 09:44.390 Sorry. 09:44.390 --> 09:45.540 So 70. 09:45.740 --> 09:46.550 61. 09:47.670 --> 09:49.230 Is not fond. 09:50.440 --> 09:52.360 And after that line here. 09:52.540 --> 09:55.870 So else if the else happens. 09:57.590 --> 09:59.120 If else happens. 09:59.420 --> 09:59.930 But why? 09:59.930 --> 10:01.370 It's showing. 10:04.250 --> 10:06.620 Result list search here. 10:06.620 --> 10:08.330 So if else happens. 10:09.720 --> 10:16.890 Then print the user that 61 is found at index. 10:17.820 --> 10:19.960 And this is our result. 10:19.980 --> 10:22.530 We will print the result integer here and then line here. 10:22.530 --> 10:26.380 And after that we are done with our code here. 10:26.400 --> 10:34.380 So fortunately, our list datatype works well and we can apply all the operation that list should have. 10:34.530 --> 10:38.400 So here let's actually open clear CLS. 10:38.550 --> 10:41.820 So if you build and run this application here. 10:42.630 --> 10:45.820 So it was main.cpp and yeah. 10:45.870 --> 10:48.000 G plus plus color. 10:48.780 --> 10:50.100 G plus plus. 10:51.520 --> 10:52.470 Cplusplus. 10:52.500 --> 10:53.760 Main.cpp. 10:56.520 --> 10:58.140 And as you can see, we get an error. 10:59.160 --> 11:03.180 Let's actually compile it and on the machine and see what happens. 11:04.210 --> 11:05.860 So 78. 11:06.100 --> 11:08.230 Yeah, we have undefined reference. 11:08.230 --> 11:11.370 So we didn't actually define this count yet. 11:11.380 --> 11:14.830 So we also we will also need to define count. 11:14.830 --> 11:15.640 So. 11:16.920 --> 11:17.730 Here. 11:18.500 --> 11:21.680 And that's the integer discount returns in just an integer. 11:22.940 --> 11:24.110 So here. 11:24.950 --> 11:26.270 Uh, integers. 11:26.580 --> 11:29.360 List count. 11:30.230 --> 11:32.180 So the count is going to be. 11:36.070 --> 11:36.610 Here. 11:36.610 --> 11:38.680 Now we're going to develop our count. 11:40.240 --> 11:41.380 Count method here. 11:41.380 --> 11:43.870 So the count method returns integer. 11:45.780 --> 11:51.540 This means that we're going to use return just and return our. 11:52.880 --> 11:53.840 Our first lecture. 11:53.840 --> 11:54.890 Create the count. 11:55.490 --> 11:57.770 My array count. 11:57.800 --> 12:00.200 Or do we have the count here? 12:00.440 --> 12:01.790 Count by default? 12:01.820 --> 12:04.100 No, we don't have anything like that. 12:04.100 --> 12:04.550 So. 12:04.550 --> 12:05.210 Yes. 12:05.780 --> 12:06.700 Integer. 12:07.460 --> 12:12.410 My count here equals the size of. 12:12.830 --> 12:21.050 Size of our array, which is going to be the size of our array is going to be like the. 12:25.260 --> 12:38.790 My items, size of my items, my items and we will use multiply it by divided by size of our my items. 12:43.600 --> 12:43.960 Here. 12:43.960 --> 12:46.660 We also have the my count here. 12:47.110 --> 12:47.800 It's actually. 12:47.800 --> 12:48.520 Yes. 12:50.020 --> 12:51.280 My count. 12:51.820 --> 12:53.560 So we also have the Mekons. 12:53.560 --> 12:54.250 So. 12:59.760 --> 12:59.960 Um. 13:00.090 --> 13:01.980 Uh, size of items. 13:03.120 --> 13:03.630 And. 13:08.080 --> 13:10.810 Size of my items and. 13:10.810 --> 13:11.230 Yeah. 13:12.360 --> 13:17.100 We will use the index and zero here. 13:17.220 --> 13:18.090 So that's it. 13:18.510 --> 13:19.950 Let's actually run our program. 13:19.950 --> 13:21.510 I think it will give it an error. 13:21.510 --> 13:24.270 Yes, it will give a no return statement, the function. 13:24.270 --> 13:32.490 So, yes, we need to return statement here, return my count, and let's run the program again. 13:32.490 --> 13:34.530 And as you can see here, we get an error. 13:35.880 --> 13:37.560 The thing is. 13:42.980 --> 13:45.500 Undefined reference to the list list here. 14:10.520 --> 14:18.350 And as you can see here, the list that Conte will return as the conte of our race.